Congratulations, you are making a big step on a long and exciting journey. Enjoy the ride.
You asked about gender therapy. Here is my two cents worth. I hear of two reasons for folks (us) going to gender therapy. The first is, we see it as an often required step in beginning hrt, a means to an end. The therapist, as used in this manner, just performs a gate keeper function. The second is, we need a skilled facilitator to aid us in working through the maze of understanding who we are and what we want and need. The therapist will achieve this by asking whatever questions necessary to get us to understand ourselves and our needs. This sounds both simple and obvious but that is not always the case. This second purpose of therapy requires finding a therapist that can understand our individual ways of thinking so that they can ask the kinds of questions that we can relate to in a manner we can actually hear. You may have to interview a few therapists to find one that can get you to think through the big stuff.
Many of us only want to get the hrt letter and believe that we know ourselves well enough to get by. Many of us realize that talking with someone to help us better understand why we are who we are and help us to make better decisions is a beneficial thing. I know that I was driven to just get the "letter" but along the way my wife and I got far more out of it that we expected.
Take it for what it is worth, Anne